Safety attachment foe elevatoes



' 2 Sheets-Shet 1. v P. W. VOERDE. SAFETY ATTAOHMENT FOR ELEVATORS.

(No Model.)

Patented June- 20, 1882.

Fi i

Jud/e317 I (No Model.) 2 SheetsSheet 2.

F. W. VOE RDE. SAFETY ATTACHMENT POR- ELEVATORS.

No. 259,951. Patented June 20,1882.

Inva id? or,

UNITED STATES PATENT OFFICE.

FREDERIGK W. VOERDE, OFOHIGAGO, ILLINOIS, ASSIGNOR TO PETER SINGER, OF SAME PLACE.

SAFETY ATTACHMENT FOR ELEVATORS.

SPECIFICATION forming" part of Letters Patent No. 259,951, dated June 20, 1882..

. Application filed April 4. 1882. (No model.)

To all whom it may concern:

Beitknown that I, FREDERICK W.VOERDE, residing at Ohica go, in the countyof Cook and State of Illinois, and a citizen of the United States,have invented new and usefulImprovements in Safety Attachments for Elevators, of which the following is a full description, reference being had to the accompaning drawings, in which- Figure 1 is a front elevation; Fig. 2, an end elevation of the upper end of the cage or platform; Fig. 3, a cross-section on line as a: of Fig. 1; Fig. 4., a plan view of so much of the top as shows the cross rods or shafts foroperating the eccentrics; Figs. 5 and 6, modifications showing the method of operating the safety devices by a friction-wheel, and Figs. 7 and 8 amodification showing the method of operating the safety devices by a gear-wheel and rack.

The object of this invention is to provide an elevator platform or cage with a safety attachment operated or released by a ball-governor, so that whenever such platform or cage attains an overspeed the safety devices will be set and the descent of the platform stopped; and the nature of my invention consists in the several parts and combinations of parts hereinafter set forth and claimed as new.

In the drawings, A indicates the guide-bars for the platform; B, the platform; B, crossbars at the upper end of the platform; 0, a lifting rope or cable; D, cross rods or shafts for operating the eccentrics; E, the eccentrics; F, a ball-governor; G, a sub-frame for holding the governor and its operating devices in position; a, guide plates or projections; b, a toothed rack; c, a shaft for operating the governor; d, a grooved pulley on the shaft 0; c, the sliding cross-head of the governor; f, a miter-wheel on the staff or spindle of the governor g, a corresponding wheel on the shaft 0 h, an additional sliding cross-head on the governor; i, levers attached to the cross rods or shafts D; 7', springs, and kbends in the levers '5 or the shafts or rods D.

The guides A are applied to the elevator shaft or well in the usual manner, and the platform or cage B is made in any of the usual forms for elevating passengers or goods-=a simple platform for elevating goods being the one shown. 7

My safetydevices are applicable to all forms of cages or platforms, and I do not therefore limit myself to any special construction thereof.

'At the upper end of the platform I place or attach cross rods or shafts D, which are provided at their ends with eccentrics E, which may be roughened, as shown, in order to make their grip and contact with the guides more certain and secure when the eccentrics are thrown into operation. These shafts are provided with levers or handles '5, which may be attached direct, as shown in Fig. 4, or with the bend k, as shown in Fig. 3, as all that is required is to bring them into a proper relation with the cross-head h of the governor. These levers or handles t are provided with springs j, which are of sufficient strength to rotate the shafts D while'the eccentrics are out of contact. These springs, acting through the levers orhandles 13, bring the eccentrics E into contact with the sides of the guide A, when the further descent of the platform continues the rotation of the eccentrics E and the shafts, so that astrong or heavy spring is not necessary, and by increasing the length of the bend k, or extending out horizontal arms in the place of such bend, weights may be applied to take the place of springs, or to aid them, or they may be applied directly to the levers i.

The governor F is made in the usual form of a ball-governor arranged to have the speed of its rotation elevate or depress the balls.

To the lower or sliding collar of the governor I attach a cross bar or head, h, through which the collar of the governor rotates; but such collar is provided with shoulders, so 'that the cross head or bar 71. will rise or fall with the cross-head c and collar of the governor.

The cross-head h is provided near its outer ends with holes fitted to receive the upper ends of the levers i, and when the cage is in its ordinary use or operation these levers t will be held in the cross-head h, as shown in Fig. 2; but whenever a rate of speed is attained sufficient to lift the cross-head h above the ends of the lovers t, then they will be thrown out, as shown in Fig; 3, which motion brings the eccentrics into operation and locks the cage or platform, so as to prevent its further descent down the shaft.

The governor is operated by the shaft 0 and the miter or bevel wheels f g.

The shaft 0 may be operated by a cord, d, stretched from end to end of the elevator-shaft, and made to take one or more turns around a grooved pulley, d, as shown in Fig. 1; or this shaft may be operated by a friction-wheel. cl, made to travel against the side of the guide A with suflicient pressure to rotate it; or it may be driven positively by the gear-wheel r1 running in the toothed rack I), attached to one of the guides A.

I prefer the use of adouble set of eccentrics and two shafts D; but it is evident that one set of eccentrics working in connection with sliding guides a on the opposite side of the main guides A may be used as a safety attachment with good results.

I am aware that cross-shafts with eccentrics similar to D and E have been heretofore used,

and I do not therefore claim them as my invention; but

What I claim as new, and desire to secure by Letters Patent, is

l. The combination of one or more levers or handles, 2', with the cross-head h, shaft or shafts I), and eccentrics E, substantially as specified.

2. A non-rotatingcross-head adapted to rise and falL'in combination with a ball-governor, shafts carrying eccentrics, and devices connecting the cross-head with the said shafts, substantially as and for the purpose described.

3. The springs or their equivalent, in combination with the levers t and shafts D, for rotating the shafts sufficiently to bring the eccentrics into action, substantially as specified.

FREDERICK W. VOERDE.

Witnesses:

ALBERT H. ADAMS, WILLIAM A. SINGER. 

